From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750889Ab3GBEDx (ORCPT ); Tue, 2 Jul 2013 00:03:53 -0400 Received: from moutng.kundenserver.de ([212.227.17.9]:52784 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707Ab3GBEDw (ORCPT ); Tue, 2 Jul 2013 00:03:52 -0400 Message-ID: <1372737803.7363.101.camel@marge.simpson.net> Subject: Re: sched: context tracking demolishes pipe-test From: Mike Galbraith To: Peter Zijlstra Cc: LKML , Ingo Molnar Date: Tue, 02 Jul 2013 06:03:23 +0200 In-Reply-To: <1372670432.7678.114.camel@marge.simpson.net> References: <1372579056.6607.16.camel@marge.simpson.net> <20130630212940.GK6626@twins.programming.kicks-ass.net> <1372658875.7678.17.camel@marge.simpson.net> <20130701080638.GM6626@twins.programming.kicks-ass.net> <1372669941.7678.113.camel@marge.simpson.net> <1372670432.7678.114.camel@marge.simpson.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Provags-ID: V02:K0:G75ujiJRdDm1xOPUQMXc3NqmgeU8Cya2EIJauH4wsXW 3th46RS9PknuRuu5onRmJTZkhoTSVQrJF13dF4/StwCqt+7pY9 GJ1HybvaZkP2mdufOyFhAMnQk3hTSJk0ujdGfmZFnMHtUKL0ry 3MUhSxCwkcS+NawunnblTd51/FWU8/0osgZ3hXzXZdnb4qZljs 6oP4N3wtFlJDMTbRwAjt3xm6Q59dLcs60xK9bSeTdjj03LzwnK evOfCRh5UXNosoCKG1cnWucUFyC4BgTJVrzhwpW00MJuOLGuzW hrk3phDyBuGvPfj13ur1g02cHqKrGCUVZaZOO04cHlBW0cWcyM nBw6aYjfyX7YCuvzR7wSVXhQlEe5FMrS6p9gkjjIu+Lczq/w3V BWmkZV0QXYgTg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2013-07-01 at 11:20 +0200, Mike Galbraith wrote: > On Mon, 2013-07-01 at 11:12 +0200, Mike Galbraith wrote: > > On Mon, 2013-07-01 at 10:06 +0200, Peter Zijlstra wrote: > > > > > So aside from the context tracking stuff, there's still a regression > > > we might want to look at. That's still a ~10% drop against 2.6.32 for > > > TCP_RR and few percents for tbench. > > > > Yeah, known, and some of it's ours. > > (btw tbench has a ~5% phase-of-moon jitter, you can pretty much > disregard that one) Hm. Seems we don't own much of TCP_RR regression after all, somewhere along the line while my silly-tester hat was moldering, we got some cycles back.. in the light config case anyway. With wakeup granularity set to zero, per pipe-test, scheduler is within variance of .32, sometimes appearing a tad lighter, though usually a wee bit heavier. TCP_RR throughput delta does not correlate. echo 0 > sched_wakeup_granularity_ns pipe-test 2.6.32-regress 689.8 Khz 1.000 3.10.0-regress 682.5 Khz .989 netperf TCP_RR 2.6.32-regress 117910.11 Trans/sec 1.000 3.10.0-regress 96955.12 Trans/sec .822 It should be closer than this. 3.10.0-regress 2.6.32-regress 3.85% [kernel] [k] tcp_ack 4.04% [kernel] [k] tcp_sendmsg 3.34% [kernel] [k] __schedule 3.63% [kernel] [k] schedule 2.93% [kernel] [k] tcp_sendmsg 2.86% [kernel] [k] tcp_recvmsg 2.54% [kernel] [k] tcp_rcv_established 2.83% [kernel] [k] tcp_ack 2.26% [kernel] [k] tcp_transmit_skb 2.19% [kernel] [k] system_call 1.90% [kernel] [k] __netif_receive_skb_core 2.16% [kernel] [k] tcp_transmit_skb 1.87% [kernel] [k] tcp_v4_rcv 2.07% libc-2.14.1.so [.] __libc_recv 1.84% [kernel] [k] tcp_write_xmit 1.95% [kernel] [k] _spin_lock_bh 1.70% [kernel] [k] __switch_to 1.89% libc-2.14.1.so [.] __libc_send 1.57% [kernel] [k] tcp_recvmsg 1.77% [kernel] [k] tcp_rcv_established 1.54% [kernel] [k] _raw_spin_lock_bh 1.70% [kernel] [k] netif_receive_skb 1.52% libc-2.14.1.so [.] __libc_recv 1.61% [kernel] [k] tcp_v4_rcv 1.43% [kernel] [k] ip_rcv 1.49% [kernel] [k] native_sched_clock 1.35% [kernel] [k] local_bh_enable 1.49% [kernel] [k] tcp_write_xmit 1.33% [kernel] [k] _raw_spin_lock_irqsave 1.46% [kernel] [k] __switch_to 1.26% [kernel] [k] ip_queue_xmit 1.35% [kernel] [k] dev_queue_xmit 1.16% [kernel] [k] __inet_lookup_established 1.29% [kernel] [k] __alloc_skb 1.14% [kernel] [k] mod_timer 1.27% [kernel] [k] skb_release_data 1.13% [kernel] [k] process_backlog 1.26% netserver [.] recv_tcp_rr 1.13% [kernel] [k] read_tsc 1.22% [kernel] [k] local_bh_enable 1.13% libc-2.14.1.so [.] __libc_send 1.18% netperf [.] send_tcp_rr 1.12% [kernel] [k] system_call 1.18% [kernel] [k] sched_clock_local 1.07% [kernel] [k] tcp_event_data_recv 1.11% [kernel] [k] copy_user_generic_string 1.04% [kernel] [k] ip_finish_output 1.07% [kernel] [k] _spin_lock_irqsave -Mike